Summary: Demonstrates how to select mesh objects that are planar using RhinoScript.

Is there a tool or a script that will let me select all planar meshes?

Currently, RhinoScript does not have a method that returns whether or not a mesh is planar. But, if you obtain a meshes vertices, you can test to see if all of the points are coplanar.

The following example RhinoScript demonstrates how to select all planar mesh objects.

 Sub SelPlanarMeshes
   Const rhMesh = 32
   Dim arrMeshes, arrVertices, i
   arrMeshes = Rhino.ObjectsByType(rhMesh)
   If IsArray(arrMeshes) Then
     Rhino.EnableRedraw vbFalse
     For i = 0 To UBound(arrMeshes)
       arrVertices = Rhino.MeshVertices(arrMeshes(i))
       If Rhino.PointsAreCoplanar(arrVertices) Then
         Rhino.SelectObject arrMeshes(i)
       End If
     Next
     Rhino.EnableRedraw vbTrue
   End If
 End Sub

Here is a Rhino tooolbar button macro version of the above.

 _NoEcho
 _-RunScript (
 arrMeshes = Rhino.ObjectsByType(32)
 If IsArray(arrMeshes) Then
 Rhino.EnableRedraw vbFalse

 For i = 0 To UBound(arrMeshes)
 arrVertices = Rhino.MeshVertices(arrMeshes(i))
 If Rhino.PointsAreCoplanar(arrVertices) Then
 Rhino.SelectObject arrMeshes(i)
 End If
 Next
 Rhino.EnableRedraw vbTrue
 End If
 arrMeshes = vbNull
 arrVertices = vbNull
 )